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January 06, 2015


Good grief ..... and you've been up there flyin' 'round???

You're so right about the need to question research studies, then once they're published the people who interpret them as well. What's the sample like? How did they account for variables? Did they really test what they said they were testing? Etc., etc....

Ostensibly, not austensibly :-)

Joared--I only flew (as pilot in command) for another 20 years after "failing" the color-blindness test. The only time I had a real problem was in trying to read a sectional chart under the red cabin lighting during nighttime operation. ; )

Stu--Picky, picky, picky. (Thanks for pointing out my error. You can tell that I mispronounce it, too - like austenitic.) The comments have auto-correct spelling; but, the postings do not. Go figure!

I never heard of a color blind woman! A red-green color blind friend of ours married a redhead: a waste, that was.

Hattie--Color blindness is a rare condition in a woman - that's for sure! HH dislikes red hair. Fortunately for me, looks were never among his top 5 criteria in choosing a mate! Even if it were, he tells me that I am no longer a redhead! *laughing*

The following is from Inherited Colour Vision Deficiency.

"If a woman has only one colour blind ‘gene’ she is known as a ‘carrier’ but she won’t be colour blind. When she has a child she will give one of her X chromosomes to the child. If she gives the X chromosome with the faulty ‘gene’ to her son he will be colour blind, but if he receives the ‘good’ chromosome he won’t be colour blind.

"A colour blind boy can’t receive a colour blind ‘gene’ from his father, even if his father is colour blind, because his father can only pass an X chromosome to his daughters.

"A colour blind daughter therefore must have a father who is colour blind and a mother who is a carrier (who has also passed the faulty ‘gene’ to her daughter). If her father is not colour blind, a ‘carrier’ daughter won’t be colour blind. A daughter can become a carrier in one of two ways – she can acquire the ‘gene’ from a carrier mother or from a colour blind father.

"This is why red/green colour blindness is far more common in men than women."

P.S. Earlier in the article we are told, "Red/green colour blindness is passed from mother to son on the 23rd chromosome, which is known as the sex chromosome because it also determines sex."

Thanks for inspiring me to a test.
I snapshotted my blog today then converted the snapshot to a gray scale to see
if it was still usable. Yes, my fear that used/unused links would be indistinguishable was unfounded :-)
I do need to be careful about using BOLD fonts though :-(

BTW, Russian testblobs #1 and #4 are still legible even on a gray scale, so WTF?

An eye doctor gave me a color blindness test about 15 years ago. Several I had real difficulties with, and one I had no clue. He dismissed it as my being difficult as "women cant be color blind". Then why did he bother with the test?

:Looking at the picture (which I had to follow the link by the way because it didn't show up in this post), #5 - I have no idea. I can't for the life of me figure out that anything is supposed to be represented. #3 & 6 I have to stare at for about several seconds to get a sense that there is a number there, and then a bit more to know what it is. #2 is tough, but do-able fairly quickly. 1 & 4 are easy.

Then, if I use only my left eye; #1 & 4 are the only ones I can see. My right eye can see 1 and 4 and sort of 2. Amazing that I can see some with both eyes (even if difficult) that I can't see with a single eye.

Can someone tell me what is supposed to be in #5?


Bogie--Hopefully, you found a better eye doctor! Fewer than 10 in 1000 women are color blind (10 in 1000 settles the ambiguity of the grammar issue presented by 1 in 100); but, that is far from saying that a woman cannot be.

Bogie & Stu--This is what I see in the above circles: 25, 29, 45, 56, no number, and 8. As I've cautioned in other postings: My writing/thinking/saying something does not make it true. Please see later posting, "Just for fun".

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